Parents against inter-caste marriage!

My friend is in love with a guy outside her Brahmin community and they want to get married. But her parents are adamant that they would only get her married into the same community, as chances are high that the couple would remain happy.

I don't thin this is logical by any means. The boy from the same community won't come with any guarantee that he would keep the girl happy and their marriage would last for long. So why make it a fuss? Do you also think that inter-caste marriages are unsuccessful? Share your opinion.

Intercaste marriages can be successful ,sometimes even more than same caste marriages. But there are some cons. One ,you lose the connections of the extended family members i.e relatives. After marriage the husband and wife are by themselves alone. After intercaste marriages customs and traditions get diluted and the children do not have a firm footing of either caste's culture. Most importantly it is not entire feasible to trust somebody who has walked out on their own parents who were there for him or her for 25yrs. What is the guarantee that tomorrow this person will not walk out on you just like he or she did it with their parents ?